Classify these bonds as ionic, polar covalent, or nonpolar covalent.

K-Cl, H-Br, H-H

A 25.00 mL aliquot of solution has a concentration of 3.813 x 10^-5​ M, what is the concentration of the 50.0 mL solution the aliquot was taken from?

1. In reviewing the Ontario Drinking Water Standards, how does your unknown compare with the standard? How much calcium chloride or distilled water would be needed to be added to make your sample compliant?

2.explain the process by which a water softener works, please include the regeneration process.

Given the following information, answer these questions.

P₄(g) + 5 O₂(g) → P₄O₁₀(s)

ΔG⁰298  = −2748 kJ/mol2 H₂(g) + O₂(g) → 2 H₂O(l)

ΔG⁰298  = −474.2 kJ/molP₄O₁₀(s) + 6 H₂O(l) → 4 H₃PO₄(l)

ΔG⁰298  = −349 kJ/mol

(a)

Determine the standard free energy of formation, ΔG⁰f (in kJ/mol), for phosphoric acid from this information.(Assume that ΔG⁰298 for all elemental substances is negligible.)

_______ kJ/mol

(b)

How does your calculated result compare to the value in the Standard State Thermodynamic Data table? Explain.

The listed value of ΔG⁰f (in kJ/mol) = _______ kJ/mol.

Calculate the voltage of the following cell at nonstandard conditions:

Cu | Cu²⁺ (0.150 M) || Cu²⁺ (.0120 M) | Cu

Convert your final answer to mV.

Group of answer choices

64.9 mV

-32.4 mV

-16.2 mV

32.4 mV

How many molecules are contained in a 7.10-g sample of dimethylmercury?

What is the percentage of mercury (by mass) in the sample?

An extract from a toboacco leaves is completely miscible in water at temperatures below 60 C. What is the molality of a solution of this extract in water which freezes at -0.450 C. If this solution was obtained by dissolving 1.921 g of the extract in 48.92g of water, What is the molar mass of the extract? Combustion analysis of the extract yields 74.03% C, 8.70% H, and 17.27 % N by mass. What is the molecular formula of the extract?

You are provided with 5.05g of SO2 to react with 2.45 gg of O2. Indicate your theoretical yield by completing the following statements.

Match the chemical formulas and amounts in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.

The limiting reagent in the reaction is?

Regarding the theoretical yield based on the limiting reagent,(---------)mol of SO3 can be formed, which corresponds to a mass of ( --------)

The excess reagent was ( -------) and after the limiting reagent is consumed during the reaction, the mass of excess reagent remaining will be ( ----------)?

1. why does ruthenium have slow ligand exchange rate?

2. what effect does this have on cancer therapy - what are the benefits and negatives?

A liquid is contained in a reactor vessel at 115 bar absolute pressure. It is transferred to a storage vessel through a 50 mm internal diameter commercial steel pipe. The storage vessel is nitrogen blanketed, and pressure above the liquid surface is kept constant at 1500 N/m2 gauge. The total run of pipe between the two vessels is 200 m. The miscellaneous losses due to entry and exit losses, fittings, valves, etc., amount to 800 equivalent pipe diameters. The liquid level in the storage vessel is at an elevation 20 m below the level in the reactor. A turbine is fitted in the pipeline to recover the excess energy that is available, over that required to transfer the liquid from one vessel to the other. Estimate the power that can be taken from the turbine, when the liquid transfer rate is 5000 kg/h. Take the efficiency of the turbine as 70%. The properties of the fluid are density 895 kg=m3 , viscosity 0:76 mNm2s.

a The internal energy of the toaster decreases as the internal energy of the bread increases

b Heat enters the bread and the internal energy of the toaster decreases

c Work is done to the bread and the internal energy of the toaster decreases

d Work is done to the bread and heat enters the bread

a q=–,w=+

b q=+,w=–

c q=+,w=+

d q=–,w=–

3. What is the difference between heat capacity (CV) and specific heat capacity (c)?

a CV refers to isochoric conditions, whereas c does not refer to isochoric conditions

b c considers the whole system, whereas CV considers only a unit mass of the system

c CV considers the whole system, whereas c considers only a unit mass of the system

A 1 liter sample of a lake water has an Alk of .2 meq/liter and contains .18 mM of carbonate species.

a. what is the pH ?

b. how much does pH change when 5 x 10 to the -5 power mol of hydrochloric acid are added ?

* Calculate the concentration of argon in the Pacific Ocean given that the partial pressure of argon is 0.00934 atm. The Henry’s law constant for argon in water at 25ºC is 1.4 x 10-3 mol/L·atm.

* The solubility of potassium chloride (KCl) is 34.2 g per 100.0 g of water at 20ºC.

Calculate the molality of a saturated solution of potassium chloride.

Is a 4.00 m solution of potassium chloride in water at 20ºC saturated, supersaturated, or unsaturated?

Answer: saturated, supersaturated, or unsaturated

Is a 6.00 m solution of potassium chloride in water at 20ºC saturated, supersaturated, or unsaturated?

Answer: saturated, supersaturated, or unsaturated

* A supermarket brand bleach contains 4.88 g of sodium hypochlorite (NaOCl) in 100.0 g of water. Calculate the molality, mass percent, ppm, and mole fraction of sodium hypochlorite in this solution.

Molality of sodium hypochlorite in water

Mass percent of sodium hypochlorite in water

ppm of sodium hypochlorite in water

Mole fraction of sodium hypochlorite in water

The above are the data.

a) using the equation for the reaction ( Pb(NO₃)₂+2KI --> PbI₂ + 2KNO₃ ), calculate how much solid PbI₂ you should have made. This called theoretical Yield.

b) compare your actual results ( the mass of PbI₂ you made) with the theoretical yield ( the mass of PbI₂ you should have made). Calculate % yield.